Deformation Properties of TiNi Shape-Memory Alloy Wire

Abstract

The behavior of the interface and the lateral to longitudinal strain ratio due to the stress-induced martensitic transformation (SIMT) were investigated in the regions of superelasticity (SE) and shape memory effect (SME) in a TiNi shape-memory alloy wire through the tensile test. The interface between a parent phase and a martensitic phase which appears due to SIMT during the loading process and its reverse transformation during unloading starts at both ends in the gripping parts of a wire and propagates towards the central part. When the two interfaces meet, SIMT completes.